/*! UIkit 2.10.0 | http://www.getuikit.com | (c) 2014 YOOtheme | MIT License */

(function (addon) {

    var component;

    if (jQuery && jQuery.UIkit) {
        component = addon(jQuery, jQuery.UIkit);
    }

    if (typeof define == "function" && define.amd) {
        define("uikit-sticky", ["uikit"], function () {
            return component || addon(jQuery, jQuery.UIkit);
        });
    }

})(function ($, UI) {

    var $win = UI.$win,
        $doc = UI.$doc,
        sticked = [];

    UI.component('sticky', {

        defaults: {
            top: 0,
            bottom: 0,
            animation: '',
            clsinit: 'uk-sticky-init',
            clsactive: 'uk-active',
            getWidthFrom: '',
            media: false,
            target: false
        },

        init: function () {

            var wrapper = $('<div class="uk-sticky-placeholder"></div>').css({
                'height': this.element.css('position') != 'absolute' ? this.element.outerHeight() : '',
                'float': this.element.css("float") != "none" ? this.element.css("float") : '',
                'margin': this.element.css("margin")
            });

            wrapper = this.element.css('margin', 0).wrap(wrapper).parent();

            this.sticky = {
                options: this.options,
                element: this.element,
                currentTop: null,
                wrapper: wrapper,
                init: false,
                getWidthFrom: this.options.getWidthFrom || wrapper,
                reset: function (force) {

                    var finalize = function () {
                        this.element.css({"position": "", "top": "", "width": "", "left": "", "margin": "0"});
                        this.element.removeClass([this.options.animation, 'uk-animation-reverse', this.options.clsactive].join(' '));

                        this.currentTop = null;
                        this.animate = false;
                    }.bind(this);


                    if (!force && this.options.animation && UI.support.animation) {

                        this.animate = true;

                        this.element.removeClass(this.options.animation).one(UI.support.animation.end, function () {
                            finalize();
                        }).width(); // force redraw

                        this.element.addClass(this.options.animation + ' ' + 'uk-animation-reverse');
                    } else {
                        finalize();
                    }
                },
                check: function () {

                    if (this.options.media) {

                        switch (typeof (this.options.media)) {
                            case 'number':
                                if (window.innerWidth < this.options.media) {
                                    return false;
                                }
                                break;
                            case 'string':
                                if (window.matchMedia && !window.matchMedia(this.options.media).matches) {
                                    return false;
                                }
                                break;
                        }
                    }

                    var scrollTop = $win.scrollTop(),
                        documentHeight = $doc.height(),
                        dwh = documentHeight - $win.height(),
                        extra = (scrollTop > dwh) ? dwh - scrollTop : 0,
                        elementTop = this.wrapper.offset().top,
                        etse = elementTop - this.options.top - extra;

                    return (scrollTop >= etse);
                }
            };

            sticked.push(this.sticky);
        },

        update: function () {
            scroller();
        }
    });

    function scroller() {

        if (!sticked.length) return;

        var scrollTop = $win.scrollTop(),
            documentHeight = $doc.height(),
            dwh = documentHeight - $win.height(),
            extra = (scrollTop > dwh) ? dwh - scrollTop : 0,
            cls, newTop;

        if (scrollTop < 0) return;


        for (var i = 0; i < sticked.length; i++) {

            if (!sticked[i].element.is(":visible") || sticked[i].animate) {
                continue;
            }

            var sticky = sticked[i];

            if (!sticky.check()) {

                if (sticky.currentTop !== null) {
                    sticky.reset();
                }

            } else {

                if (sticky.options.top < 0) {
                    newTop = 0;
                } else {
                    newTop = documentHeight - sticky.element.outerHeight() - sticky.options.top - sticky.options.bottom - scrollTop - extra;
                    newTop = newTop < 0 ? newTop + sticky.options.top : sticky.options.top;
                }

                if (sticky.currentTop != newTop) {

                    sticky.element.css({
                        "position": "fixed",
                        "top": newTop,
                        "width": (typeof sticky.getWidthFrom !== 'undefined') ? $(sticky.getWidthFrom).width() : sticky.element.width(),
                        "left": sticky.wrapper.offset().left
                    });

                    if (!sticky.init) {

                        sticky.element.addClass(sticky.options.clsinit);

                        if (location.hash && scrollTop > 0 && sticky.options.target) {

                            var $target = $(location.hash);

                            if ($target.length) {

                                setTimeout((function ($target, sticky) {

                                    return function () {

                                        sticky.element.width(); // force redraw

                                        var offset = $target.offset(),
                                            maxoffset = offset.top + $target.outerHeight(),
                                            stickyOffset = sticky.element.offset(),
                                            stickyHeight = sticky.element.outerHeight(),
                                            stickyMaxOffset = stickyOffset.top + stickyHeight;

                                        if (stickyOffset.top < maxoffset && offset.top < stickyMaxOffset) {
                                            scrollTop = offset.top - stickyHeight - sticky.options.target;
                                            window.scrollTo(0, scrollTop);
                                        }
                                    };

                                })($target, sticky), 0);
                            }
                        }
                    }

                    sticky.element.addClass(sticky.options.clsactive);
                    sticky.element.css('margin', '');

                    if (sticky.options.animation && sticky.init) {
                        sticky.element.addClass(sticky.options.animation);
                    }

                    sticky.currentTop = newTop;
                }
            }

            sticky.init = true;
        }

    }

    // should be more efficient than using $win.scroll(scroller):
    $doc.on('uk-scroll', scroller);
    $win.on('resize orientationchange', UI.Utils.debounce(function () {

        if (!sticked.length) return;

        for (var i = 0; i < sticked.length; i++) {
            sticked[i].reset(true);
        }

        scroller();
    }, 100));

    // init code
    UI.ready(function (context) {

        setTimeout(function () {

            $("[data-uk-sticky]", context).each(function () {

                var $ele = $(this);

                if (!$ele.data("sticky")) {
                    UI.sticky($ele, UI.Utils.options($ele.attr('data-uk-sticky')));
                }
            });

            scroller();
        }, 0);
    });

    return $.fn.uksticky;
});